Quick Answer
A failing battery due to sulfation can be identified by checking for low voltage, slow charging, and high internal resistance, as well as using a multimeter to test for voltage drop during load.
Visual Inspection and Testing
To identify a failing battery due to sulfation, start by visually inspecting the battery for any signs of physical damage or corrosion. Check the battery terminals for any signs of wear or corrosion, and clean them if necessary. Next, use a multimeter to test the battery’s voltage and internal resistance. A fully charged battery should read around 12.6 volts, while a sulfated battery may read as low as 10-11 volts. You can also use a hydrometer to check the battery’s specific gravity, which should be around 1.260 for a fully charged battery.
Load Testing
Load testing is another way to identify a failing battery due to sulfation. Connect a load tester or a high-drain appliance to the battery and measure the voltage drop. A sulfated battery may drop to as low as 10-11 volts under load, while a healthy battery will maintain a voltage of around 12-12.5 volts. If the voltage drop is significant, it may indicate a sulfated battery.
Preventative Measures
Preventing sulfation is key to maintaining a healthy battery. Keep the battery charged to a level between 20-80%, and avoid deep discharging it below 20%. You can also use a battery maintainer or a trickle charger to keep the battery charged during periods of inactivity. Additionally, consider using a desulfation device or a pulse charger to help break down any sulfation that may have formed on the battery plates. These devices work by sending high-voltage pulses through the battery to help break down the sulfation and restore the battery’s capacity.
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